README updates

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3242 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 49 insertions, 1 deletions

diff --git a/nuttx/configs/mbed/README.txt b/nuttx/configs/mbed/README.txt
index 6098fc88b..c4122a6f6 100755
--- a/nuttx/configs/mbed/README.txt
+++ b/nuttx/configs/mbed/README.txt
@@ -12,6 +12,7 @@ Contents
   NuttX buildroot Toolchain

   USB Device Controller Functions

   mbed Configuration Options

+  USB Host Configuration

   Configurations

 

 Development Environment

@@ -305,7 +306,7 @@ mbed Configuration Options
 	CONFIG_NET_MULTICAST - Enable receipt of multicast (and unicast) frames.

       Automatically set if CONFIG_NET_IGMP is selected.

 

-  LPC17xx USB Configuration

+  LPC17xx USB Device Configuration

 

 	CONFIG_LPC17_USBDEV_FRAME_INTERRUPT

 	  Handle USB Start-Of-Frame events. 

@@ -320,6 +321,53 @@ mbed Configuration Options
 	CONFIG_LPC17_USBDEV_DMA

 	  Enable lpc17xx-specific DMA support

 

+  LPC17xx USB Host Configuration

+

+    CONFIG_USBHOST_OHCIRAM_SIZE

+      Total size of OHCI RAM (in AHB SRAM Bank 1)

+    CONFIG_USBHOST_NEDS

+      Number of endpoint descriptors

+    CONFIG_USBHOST_TDBUFFERS

+      Number of transfer descriptor buffers

+    CONFIG_USBHOST_TDBUFSIZE

+      Size of one transfer descriptor buffer

+    CONFIG_USBHOST_IOBUFSIZE

+      Size of one end-user I/O buffer.  This can be zero if the

+      application can guarantee that all end-user I/O buffers

+      reside in AHB SRAM.

+

+USB Host Configuration

+^^^^^^^^^^^^^^^^^^^^^^

+

+The NuttShell (NSH) mbed can be modified in order to support USB

+host operations.  To make these modifications, do the following:

+

+1. First configure to build the NSH configuration from the top-level

+   NuttX directory:

+

+   cd tools

+   ./configure mbed/nsh

+   cd ..

+

+2. Then edit the top-level .config file to enable USB host.  Make the

+   following changes:

+

+   CONFIG_LPC17_USBHOST=n

+   CONFIG_USBHOST=n

+   CONFIG_SCHED_WORKQUEUE=y

+

+When this change is made, NSH should be extended to support USB flash

+devices.  When a FLASH device is inserted, you should see a device

+appear in the /dev (psuedo) directory.  The device name should be

+like /dev/sda, /dev/sdb, etc.  The USB mass storage device, is present

+it can be mounted from the NSH command line like:

+

+   ls /dev

+   mount -t vfat /dev/sda /mnt/flash

+

+Files on the connect USB flash device should then be accessible under

+the mountpoint /mnt/flash.

+

 Configurations

 ^^^^^^^^^^^^^^